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Wg and Lin are sufficient for specifying the 4° cell fate. (A) Wild type. (B) UAS–ArmS10; Arm–GAL4. Activation of Wg signaling broadly shows replacement of 1°–3° fates by excess 4° fates. (C) UAS–Lin Arm–GAL4. Ubiquitous overexpression of Lin also leads to replacement of 1°–3° cell fates with the 4° fates. (D) Ptc–GAL4; UAS–Lin. Occasionally, overexpression of Lin is not sufficient to specify 4° fate in place of 2° (asterisk). Bar, 10 μm in all panels.
